Development of methodological proceeding for seismic oceanography using legacy multi-channel seismic data of the oil and gas industry

Ristow, João P.; Cordioli, Júlio A.; Barao, Marcus V. C.; Klein, Antonio H. F.; Barrault, Guillaume

doi:10.1109/rioacoustics.2017.8349710

Cited by 2 publications

(1 citation statement)

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“…Hardy et al (2007) and Jones et al (2008) combined linear moveout with dip filtering. Ristow et al (2017) used a combination of a linear Radon transformation with adaptive subtraction. Often, another source of coherent noise originates from the echo of the previous shot, but this noise is not addressed herein.…”

Section: Introductionmentioning

confidence: 99%

Geostatistical Seismic Inversion for Temperature and Salinity in the Madeira Abyssal Plain

et al. 2021

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A two-dimensional multichannel seismic reflection profile acquired in the Madeira Abyssal Plain during June 2016 was used in a modeling workflow comprising seismic oceanography processing, geostatistical inversion and Bayesian classification to predict the probability of occurrence of distinct water masses. The seismic section was processed to image in detail the fine scale structure of the water column using seismic oceanography. The processing sequence was developed to preserve, as much as possible, the relative seismic amplitudes of the data and enhance the shallow structure of the water column by effectively suppressing the direct arrival. The migrated seismic oceanography section shows an eddy at the expected Mediterranean Outflow Water depths, steeply dipping reflectors, which indicate the possible presence of frontal activity or secondary dipping eddy structures, and strong horizontal reflections between intermediate water masses suggestive of double diffuse processes. We then developed and applied an iterative geostatistical seismic oceanography inversion methodology to predict the spatial distribution of temperature and salinity. Due to the lack of contemporaneous direct measurements of temperature and salinity we used a global ocean model as spatial constraint during the inversion and nearby contemporaneous ARGO data to infer the expected statistical properties of both model parameters. After the inversion, Bayesian classification was applied to all temperature and salinity models inverted during the last iteration to predict the spatial distribution of three distinct water masses. A preliminary interpretation of these probabilistic models agrees with the expected ocean dynamics of the region.

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Section: Introductionmentioning

confidence: 99%

Geostatistical Seismic Inversion for Temperature and Salinity in the Madeira Abyssal Plain

et al. 2021

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Enhancing low-frequency water-column acoustic reflections in marine multichannel seismic data for seismic oceanography

Zou

Zhang

2021

The Journal of the Acoustical Society of America

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Reflections of low-frequency, broadband airgun signals from ocean water columns have long been collected in modern marine seismic surveys. However, they were barely examined because of their weak amplitude (following from low acoustic impedance contrast in water columns) and the lack of application interests. Nevertheless, in the past decades, a new cross-discipline “seismic oceanography” has developed the interest to use these water-column reflection signals to image the ocean structures. Motivated by seismic oceanography applications, we examined the acoustic multipath structure of marine seismic survey data with a focus on water-column reflections, and developed a two-step matched filtering approach to enhance water-column reflection and suppress the unwanted bubble waves. The approach was applied to process data collected from the Gulf of Mexico and led to an improvement in imaging mesoscale ocean structures when compared with the traditional matched filtering approach. For the specific data we examined, the results reveal a 11.3-dB improvement of signal-to-noise ratio by removing the noise and a 8-dB improvement of signal-to-reverberation ratio by suppressing bubble waves, while not affecting the information of ocean structures embedded in the signals. This study gains insights into features of water-column acoustic reflections and provides better tools for acoustic imaging of mesoscale ocean structures.

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Development of methodological proceeding for seismic oceanography using legacy multi-channel seismic data of the oil and gas industry

Cited by 2 publications

References 20 publications

Geostatistical Seismic Inversion for Temperature and Salinity in the Madeira Abyssal Plain

Geostatistical Seismic Inversion for Temperature and Salinity in the Madeira Abyssal Plain

Enhancing low-frequency water-column acoustic reflections in marine multichannel seismic data for seismic oceanography

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